I have way too many favourites to actually remember all of them but I'll work my way through my DVD collection in my mind and see if I can remember a lot of them.

Star Wars original trilogy
Grosse Point Blank
Amelie
The Royal Tennenbaums
The Third Man
To Have and Have Not
Planet of The Apes (original)
King Kong (original)
Wizard of Oz
Alien
Blade Runner
Brazil
Baron Munchausen
Lost In Translation
Near Dark
Stand By Me
The Warriors
Withnail And I
Gregory's Girl
Captain Kronos Vampire Hunter
A Fistful of Dollars
For A Few Dollars More
The Good, The Bad And The Ugly
Silent Running
Swingers
Sin City
Gilda
The Prisoner Of Zenda (Ronald Colman)
Back To The Future
Aliens
The Terminator
The Thing

Snatch
Koyaanisqatsi (thanks to Ranger for making me dig that out again)
The Hitcher
Jaws
Logans Run
The Wild Bunch
What's Up Doc?
Manhattan
A Clockwork Orange
Beetlejuice
Body Heat
Cat On A Hot Tin Roof
The Usual Suspects
Trainspotting
Pulp Fiction
Some Like It Hot
Roger Rabbit

I just saw "Serenity" for the first time last night, and thought it was one of the most brilliant films I've seen in a while. I'm saw glad I took the time to sit and watch it! I never saw the series, but now I'm going to be scrambling to find it...

I have a "no matter how many times I've seen it, if it's on I stop and sit and watch" list too! It includes Aliens ("Game over, man, game over...") and The Princess Bride, too, as well as
Field of Dreams ("People will come, Ray"...)
Raising Arizona (no matter how many times I've seen it, and it's been dozens, I laugh irrationally every time when Holly Hunter whacks the motorcycle guy with the plank...)
Rainman
and any of the 6 Star Wars films...

Aha...Oh Brother Where Art Thou, The Big Lebowski, Millers Crossing. The last one especially is one of those films that stayed with me from first watching. I almost don't need to see it again it's that vivid in my mind.

It's brilliant! The cinematography is great, the story fresh and makes sense (as long as you relaise it's not overnight he learns the language, but that the journey took ages...), action with a touch of comedy.

A Clockwork Orange
Amelie
Being John Malkovich
Doctor Strangelove
Donnie Darko
Fear and Loathing in Las Vegas
Hedwig and The Angry Inch
Howl's Moving Castle
Spirited Away
The Big Lebowski
The Life Aquatic with Steve Zissou
The Royal Tenenbaums
The Shining
12 Monkeys
28 Days Later
Memento

An Officier and a Gentleman
Pretty Woman
Ghost
One Flew Over the Cuckoos Nest
Wizard of Oz
E.T.
The King and I
The Untouchables and every other film with Sean Connery in it
Indiana Jones films
Trainspotting which was so funny seeing this in a cinema in England as it had subtitles! ( G you were drunk at the time, remember?)

hmm lets see heres a few of my favorites
clerks 1 & 2
dogma
meet the feebles
Sin City
Dr. Strangelove
North by Northwest
Full Metal Jacket
Serenity
Hitchhikers Guide to the Galaxy
High Fidelity
The Usual Suspects
The Producers
among many other those are just what came to mind now

I give up, I have tried to come up with a short list, but it's over 100 long.
If I had to narrow it down to one type, then I'd stick with Westerns. There's just nothing better than a good old gun fight to get the blood pumping.

Apocalypse Now (Directors Cut)
Lord of the Rings (Trilogy - Directors Cut)
Deer Hunter
We were soldiers
Platoon
Silent Running
Aliens
Arthur
Airplane
Bonnie and Clyde
Picnic at Hanging Rock
Walkabout
Day after Tomorrow (first half for effects)
Early Woody Allen
Stalingrad
Godfather (all parts)
Grosse Pointe Blank
Vanishing Point
Zabriskie point
The Body - (Music by Roger Waters and Geeson)
The Valley (obscured by clouds)
French Connection
... and any Science Fiction for eye-candy watching especially the various Dune (science fiction channel production) films and not the early film with Sting (rubbish)
There are so many others

I went through some old notebooks at my mum's house last night - I'm in the middle of clearing out some of my old things as she's retiring soon and is moving home. These notebooks were the closest I came to keeping a diary when I was about 15 years old ( a very long time ago).

Anyway, there were lists and lists of things I liked - music and films mostly.

My favourite films as they were back when I was a weird teenager

Star Wars
The Empire Strikes Back
Return Of The Jedi
Blade Runner
Conan The Barbarian
Hawk The Slayer
The Warriors
Raiders Of The Lost Ark
ET
Close Encounters Of The 3rd Kind
Star Trek 2 - The Wrath Of Khan
The Terminator
Alien
Captain Kronos Vampire Hunter
The Land That Time Forgot
Superman The Movie
Grease
The Spy Who Loved Me
Firefox
Legend
Clash Of The Titans
Jason And The Argonauts
The Golden Voyage of Sinbad

*it has to be said at this point that I was absolutely mad about Ray Harryhausen movies*

It was kind of interesting to read - this particular list was films to own on video, with ones I owned or had taped from the tv ticked off. What was mostly interesting were the films that I still watch now and the ones that I haven't seen for years. Oh and the ones that I consider to be rubbish now. A Boy And His Dog is great. If you haven't seen it you need to see it now. It's based on a book by Harlan Ellison and stars a young Don Johnson. He's travelling around a post nuclear war world accompanied by his dog with whom he can communicate telepathically. Apparently it was a huge influence on the Mad Max movies, but is a lot more 'science fiction' than those and quite dark and funny.

Best action flicks:
--------------------
Die Hard with a Vengeance
The Long Kiss Goodnight
Con Air

Classics:
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North By Northwest
The Court Jester
The Rocky Horror Picture Show (seen it about 30 times)

Period:
---------
A Knight's Tale
Kingdom of Heaven
Rob Roy
El Cid

SciFi/Fantasy/etc:
----------------------
The Princess Bride
Ladyhawke (I just cannot bring myself to dislike this flick)
The Matrix (all three, but especially the first)
Batman (the first - the second was OK, after that it went way south)

Comedy:
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Bridget Jones' Diary
Monty Python's The Meaning of Life
Shrek
Four Weddings and a Funeral
Groundhog Day

Oddball flicks not everyone may know about:
------------------------------------------------------
Grosse Pointe Blank (does Cusack ever NOT do a good job?)
Peter's Friends (slightly bittersweet comedy with more British comedians than you can shake a stick at)
An Ideal Husband (Minnie Driver, Rupert Everett, plus an Oscar Wilde story - if you like Wilde, you're gonna love it)
Orlando (Tilda Swinton does a great job of acting male and female in the same movie, and the costumes are gorgeous)
Baraka (about as arty as it gets, and simply stunning)

Triplets of Belleville: a French Anime (nothing like the japanese kind) that won numerous awards and is hilarious. Let me count... there's, if I'm not forgetting any, 10 spoken words in the whole movie. WATCH IT!

Blue's Brothers
Philedalphia
The Power of One
Anything by M. Night Shyamalan
Saw I, not II
Fried Green Tomatoes
On Golden Pond
The Meaning of Life
The Life of Brian
The Search for the Holy Grail
Spider-Babe- Hilarious film, i suggest you watch it if you can handle a certain amount of exposed flesh
The Hobbit- the one done cartoon style. the opening song makes me laugh so hard... "THE greaaaaatest adveeeentuuuree....."

I love a lot of the movies already posted, but I tried to post a couple of new ones that people may not have heard of.